WO2017078375A1 - Short focus lens optical system and imaging device including the same - Google Patents

Short focus lens optical system and imaging device including the same Download PDF

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Publication number
WO2017078375A1
WO2017078375A1 PCT/KR2016/012475 KR2016012475W WO2017078375A1 WO 2017078375 A1 WO2017078375 A1 WO 2017078375A1 KR 2016012475 W KR2016012475 W KR 2016012475W WO 2017078375 A1 WO2017078375 A1 WO 2017078375A1
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WIPO (PCT)
Prior art keywords
lens
face
optical system
facing
optical axis
Prior art date
Application number
PCT/KR2016/012475
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English (en)
French (fr)
Inventor
Min Heu
Jung-Pa Seo
Hyun-Jea Kim
Yong-Jae Lee
Hwan-Seon Lee
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to CN201680063961.4A priority Critical patent/CN108351491B/zh
Priority to EP16862391.6A priority patent/EP3335067B1/en
Publication of WO2017078375A1 publication Critical patent/WO2017078375A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only

Definitions

  • the present disclosure relates to a lens optical system and an electronic device including the lens optical system.
  • the present disclosure relates to a short focus lens optical system that is provided in, for example, an imaging device for use in electronic devices.
  • Imaging devices e.g., a camera capable of photographing a still image or a video
  • a solid image sensor e.g., a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS)
  • CCD Charge Coupled Device
  • CMOS Complementary Metal-Oxide Semiconductor
  • Such imaging devices that use a solid image sensor (a CCD or a CMOS) replace other optical devices that use film due to the easy image storage and reproduction, as well as smaller size.
  • a short focus lens optical system which is constituted with a combination of lenses, may have, for example, a lower F number and a less aberration, thereby allowing higher quality and/or higher resolution images and/or video to be acquired.
  • a large number of lenses generally are necessary in order to obtain a lower F number and less aberration, for example, in order to obtain a bright image with high resolution.
  • Such an optical device has generally been configured in the past as a device specialized to photographing, such as a DSLR camera, but recently has also been used in a miniaturized electronic device, such as a mobile communication terminal or smartphone.
  • the present disclosure provides a short focus lens optical system that is miniaturized by being equipped with a small number of lenses (e.g., six (6) lenses), and also provides an imaging device including the short focus lens optical system.
  • a small number of lenses e.g., six (6) lenses
  • embodiments disclosed in the present disclosure provides a short focus lens optical system that is excellent in optical characteristics (e.g., an aberration characteristic, a wide angle characteristic, and/or a brightness characteristic) even though the short focus lens optical system is equipped with a small number of lenses (e.g., six (6) lenses), and also provides an electronic device including the short focus lens optical system.
  • optical characteristics e.g., an aberration characteristic, a wide angle characteristic, and/or a brightness characteristic
  • embodiments disclosed in the present disclosure may provide a short focus lens optical system that is excellent in optical characteristics even though the imaging device is equipped with a small number of lenses (e.g., six (6) lenses), thereby allowing the short focus lens optical system to be easily equipped in a miniaturized electronic device and to acquire a high resolution still image and/or video.
  • a small number of lenses e.g., six (6) lenses
  • an optical system may include: a first lens having a positive refractive power and disposed along an optical axis and to face an object, the first lens further having a first convex face facing the object; a second lens having a positive refractive power and disposed along the optical axis adjacent to the first lens, the second lens further having a second convex face facing the object; a third lens having a negative refractive power and disposed along the optical axis adjacent to the second lens, the third lens further having a third concave face facing an image sensor; a fourth lens disposed along the optical axis adjacent to the third lens, the fourth lens being an aspherical lens; a fifth lens disposed along the optical axis adjacent to the fourth lens, the fifth lens being an aspherical lens and having a fourth face facing the object, the fourth face being convex where the fifth lens intersects the optical axis; and a sixth lens disposed along the optical axis adjacent to the fifth lens, the sixth lens is an
  • f represents a focal distance of the optical system
  • f2 represents a focal distance of the second lens 102
  • an imaging device may include: an optical system; an image sensor for detecting an image of an object; and an image signal processor.
  • the optical system may include: a first lens having a positive refractive power and disposed along an optical axis and to face the object, the first lens further having a first convex face facing the object; a second lens having a positive refractive power and disposed along the optical axis adjacent to the first lens, the second lens further having a second convex face facing the object; a third lens having a negative refractive power and disposed along the optical axis adjacent to the second lens, the third lens further having a third concave face facing the image sensor; a fourth lens disposed along the optical axis adjacent to the third lens, the fourth lens being an aspherical lens; a fifth lens disposed along the optical axis adjacent to the fourth lens, the fifth lens being an aspherical lens and having a fourth face facing the object, the fourth face being convex where the fifth lens intersects the optical
  • f represents a focal distance of the optical system
  • f2 represents a focal distance of the second lens 102.
  • a short focus lens optical system is equipped with a small number of (e.g., six (6)) lenses, but may acquire a bright image with a wide angle and high resolution by adjusting curvature radii of refractive faces of each of the lenses in the optical system and/or by including aspherical lenses in the optical system.
  • the size of the short focus lens optical system e.g., the length of the optical system in the optical axis direction
  • the short focus lens optical system is easily mounted even in a miniaturized electronic device such as a smart phone.
  • FIG. 1 is a view illustrating a configuration of a short focus lens optical system according to one of various embodiments of the present disclosure
  • FIG. 2 is a graph illustrating a spherical aberration of the short focus lens optical system according to one of various embodiments of the present disclosure
  • FIG. 3 is a graph illustrating an astigmatism of the short focus lens optical system according to one of various embodiments of the present disclosure
  • FIG. 4 is a graph illustrating a distortion rate of the short focus lens optical system according to one of various embodiments of the present disclosure
  • FIG. 5 is a view illustrating a configuration of a short focus lens optical system according to another one of various embodiments of the present disclosure
  • FIG. 6 is a graph illustrating a spherical aberration of the short focus lens optical system according to another one of various embodiments of the present disclosure.
  • FIG. 7 is a graph illustrating an astigmatism of the short focus lens optical system according to another one of various embodiments of the present disclosure.
  • FIG. 8 is a graph illustrating a distortion rate of the short focus lens optical system according to another one of various embodiments of the present disclosure.
  • FIG. 9 is a view illustrating a configuration of a short focus lens optical system according to still another one of various embodiments of the present disclosure.
  • FIG. 10 is a graph illustrating a spherical aberration of the short focus lens optical system according to still another one of various embodiments of the present disclosure.
  • FIG. 11 is a graph illustrating an astigmatism of the short focus lens optical system according to still another one of various embodiments of the present disclosure.
  • FIG. 12 is a graph illustrating a distortion rate of the short focus lens optical system according to still another one of various embodiments of the present disclosure.
  • FIG. 13 is a view illustrating a configuration of a short focus lens optical system according to still another one of various embodiments of the present disclosure.
  • FIG. 14 is a graph illustrating a spherical aberration of the short focus lens optical system according to still another one of various embodiments of the present disclosure.
  • FIG. 15 is a graph illustrating an astigmatism of the short focus lens optical system according to still another one of various embodiments of the present disclosure.
  • FIG. 16 is a graph illustrating a distortion rate of the short focus lens optical system according to another one of various embodiments of the present disclosure.
  • FIG. 17 is a view illustrating a configuration of a short focus lens optical system according to yet another one of various embodiments of the present disclosure.
  • FIG. 18 is a graph illustrating a spherical aberration of the short focus lens optical system according to yet another one of various embodiments of the present disclosure.
  • FIG. 19 is a graph illustrating an astigmatism of the short focus lens optical system according to yet another one of various embodiments of the present disclosure.
  • FIG. 20 is a graph illustrating a distortion rate of the short focus lens optical system according to yet another one of various embodiments of the present disclosure.
  • first element e.g., first element
  • second element e.g., the element may be connected directly to the another element or connected to the another element through yet another element (e.g., third element).
  • the expression “device configured to” may mean that the device, together with other devices or components, "is able to.”
  • the phrase “processor adapted (or configured) to perform A, B, and C” may mean a dedicated processor (e.g., embedded processor) only for performing the corresponding operations or a generic-purpose processor (e.g., central processing unit (CPU) or application processor (AP)) that can perform the corresponding operations by executing one or more software programs stored in a memory device.
  • a dedicated processor e.g., embedded processor
  • a generic-purpose processor e.g., central processing unit (CPU) or application processor (AP)
  • first element when an element (e.g., first element) is referred to as being (operatively or communicatively) "connected,” or “coupled,” to another element (e.g., second element), it may be directly connected or coupled directly to the other element or any other element (e.g., third element) may be interposer between them.
  • first element when an element (e.g., first element) is referred to as being “directly connected,” or “directly coupled” to another element (second element), there are no element (e.g., third element) interposed between them.
  • the terms are used to describe one or more specific embodiments, and are not intended to limit the present disclosure.
  • the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the terms "include” or “have” indicate existence of a feature, a number, a step, an operation, a structural element, parts, or a combination thereof, and do not previously exclude the existences or probability of addition of one or more another features, numeral, steps, operations, structural elements, parts, or combinations thereof.
  • An electronic device may include at least one of, for example, a smart phone, a tablet Personal Computer (PC), a mobile phone, a video phone, an electronic book reader (e-book reader), a desktop PC, a laptop PC, a netbook computer, a workstation, a server, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a MPEG-1 audio layer-3 (MP3) player, a mobile medical device, a camera, and a wearable device.
  • a smart phone a tablet Personal Computer (PC), a mobile phone, a video phone, an electronic book reader (e-book reader), a desktop PC, a laptop PC, a netbook computer, a workstation, a server, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a MPEG-1 audio layer-3 (MP3) player, a mobile medical device, a camera, and a wearable device.
  • PC Personal Computer
  • PMP Portable Multimedia Player
  • MP3 MPEG-1 audio layer-3
  • the wearable device may include at least one of an accessory type (e.g., a watch, a ring, a bracelet, an anklet, a necklace, a glasses, a contact lens, or a Head-Mounted Device (HMD)), a fabric or clothing integrated type (e.g., an electronic clothing), a body-mounted type (e.g., a skin pad, or tattoo), and a bio-implantable type (e.g., an implantable circuit).
  • an accessory type e.g., a watch, a ring, a bracelet, an anklet, a necklace, a glasses, a contact lens, or a Head-Mounted Device (HMD)
  • a fabric or clothing integrated type e.g., an electronic clothing
  • a body-mounted type e.g., a skin pad, or tattoo
  • a bio-implantable type e.g., an implantable circuit
  • the electronic device may be a home appliance.
  • the home appliance may include at least one of, for example, a television, a Digital Video Disk (DVD) player, an audio, a refrigerator, an air conditioner, a vacuum cleaner, an oven, a microwave oven, a washing machine, an air cleaner, a set-top box, a home automation control panel, a security control panel, a TV box (e.g., Samsung HomeSync TM , Apple TV TM , or Google TV TM ), a game console (e.g., Xbox TM and PlayStation TM ), an electronic dictionary, an electronic key, a camcorder, and an electronic photo frame.
  • DVD Digital Video Disk
  • the electronic device may include at least one of various medical devices (e.g., various portable medical measuring devices (a blood glucose monitoring device, a heart rate monitoring device, a blood pressure measuring device, a body temperature measuring device, etc.), a Magnetic Resonance Angiography (MRA), a Magnetic Resonance Imaging (MRI), a Computed Tomography (CT) machine, and an ultrasonic machine), a navigation device, a Global Positioning System (GPS) receiver, an Event Data Recorder (EDR) , a Flight Data Recorder (FDR) , a Vehicle Infotainment Devices, an electronic devices for a ship (e.g., a navigation device for a ship, and a gyro-compass), avionics, security devices, an automotive head unit, a robot for home or industry, an automatic teller's machine (ATM) in banks, point of sales (POS) in a shop, or internet device of things (e.g., a light bulb, various sensors, electric or gas
  • the electronic device may include at least one of a part of furniture or a building/structure, an electronic board, an electronic signature receiving device, a projector, and various kinds of measuring instruments (e.g., a water meter, an electric meter, a gas meter, and a radio wave meter).
  • the electronic device may be a combination of one or more of the aforementioned various devices.
  • the electronic device may also be a flexible device.
  • the electronic device according to an embodiment of the present disclosure is not limited to the aforementioned devices, and may include a new electronic device according to the development of technology.
  • the term "user” may indicate a person using an electronic device or a device (e.g., an artificial intelligence electronic device) using an electronic device.
  • FIG. 1 is a view illustrating a configuration of a short focus lens optical system 100 according to one of various embodiments of the present disclosure.
  • the short focus lens optical system 100 may include a plurality of lenses 101, 102, 103, 104, 105, and 106, and an image sensor 108.
  • the image sensor 108 may be configured in an optical device and/or an image device, and the short focus lens optical system including the plurality of lenses may be mounted in the optical device and/or the imaging device in conjunction with the image sensor 108.
  • the image sensor 108 is provided in the short focus lens optical system 100.
  • the image sensor 108 may also be mounted in an optical device and/or an imaging device, which are equipped with short focus lens optical system 100, such that the image sensor 108 is separate from the optical system 100.
  • the image sensor 108 may include a sensor, such as a Complimentary Metal Oxide Semiconductor (CMOS) image sensor or a Charge Coupled Device (CCD).
  • CMOS Complimentary Metal Oxide Semiconductor
  • CCD Charge Coupled Device
  • the image sensor 108 may be a device that converts an image of an object to an electric image signal.
  • the lenses of the short focus lens optical system 100 may include one or more plastic lenses, and the short focus lens optical system 100 may have a field angle of about 80 degrees through the combination of the lenses.
  • the plurality of lenses may include first, second, third, fourth, fifth, and sixth lenses 101, 102, 103, 104, 105, and 106 that are arranged in this order from an object side O to an image side I.
  • the sixth lens 106 may have a side S12 that is adjacent to, for example, the position where the image sensor 108 is disposed.
  • the fact that the sixth lens 106 is adjacent to the image sensor 108 may signify that the sixth lens 106 and the image sensor 108 are immediately next to each other while coinciding on an optical axis, in this example the optical axis O-I.
  • Each of the first to sixth lenses 101, 102, 103, 104, 105, and 106 may be plastic lenses, and the first to sixth lenses 101, 102, 103, 104, 105, and 106 may be arranged in an optical axis alignment state with, for example, the image sensor 108 so as to form the optical axis O-I of the short focus lens optical system 100.
  • the first lens 101 may have positive refractive power
  • the second lens 102 may have positive refractive power
  • the third lens 104 may have negative refractive power.
  • the fourth to sixth lens 104, 105, and 106 may have positive or negative refractive power.
  • the fourth to sixth lens 104, 105, and 106 may not have refractive power.
  • a face S1 of the first lens 101, which faces the object side O may be convex.
  • a face S3 of the second lens 102, which faces the object side O, and a face S4 of the second lens 102, which faces the image side I may also be convex.
  • a face S6 of the third lens 103, which faces the image side I, may be concave, and a face S9 of the fifth lens 105, which faces the object side O, may be convex where the fifth lens intersects the optical axis O-I.
  • the fourth lens 104, the fifth lens 105, and the six lens 106 may be aspherical lenses.
  • the image side may refer to the direction towards the imaging face 181 of the image sensor 108, while the object side may refer to the direction towards the object who image is being captured by the image sensor 108.
  • an "object side face" of a lens may refer to a lens face of a lens on the object side with respect to the optical axis O-I.
  • the object side is the left side of Fig. 1.
  • an "image side face” may refer to a lens face of a lens on the image side with respect to the optical axis O-I.
  • the image side is the right side of Fig. 1.
  • the imaging face 181 may be, for example, a face of an imaging device or an image sensor.
  • a lens with positive refractive power When parallel beams of light are incident on a lens with positive refractive power, the beams may converge while passing through the lens.
  • a lens with positive refractive power may be a convex lens.
  • the beams when parallel beams of light are incident on a lens with negative refractive power, the beams may diverge while passing through the lens.
  • a lens with negative refractive power may be a concave lens.
  • the length of the short focus lens optical system 100 in the direction of the optical axis O-I may be reduced as the interval (e.g., an air gap) between each adjacent lenses in the first to sixth lenses 101, 102, 103, 104, 105, and 106 is reduced.
  • the interval between these lenses may be varied during the design of the optical system 100 depending on optical characteristics (e.g., an aberration characteristic, a wide angle characteristic, and/or a brightness characteristic) required for the short focus lens optical system 100.
  • all the curvature radii R3, R4, R5, R6, R7, R8, R9, R10, R11, and R12, the thicknesses, TT, Y IH , t58 (defined below), and the focus distances f, f2, and f4 of the lenses may have mm units unless especially mentioned. Further, it is noted that the thickness of the lenses, the intervals between the lenses, TT, Y IH , and t58 are distances measured with reference to the optical axis of the optical system O-I.
  • a face has a convex shape in the description for a shape of a lens
  • the optical axis portion of the corresponding face is convex (i.e. the portion of the lens intersecting the optical axis O-I is convex)
  • the optical axis portion of the corresponding face is concave.
  • the edge portion of the lens may be concave.
  • the edge portion of the lens may be convex.
  • an "inflection point" used in the following detailed description and claims means a point at which the curvature radius is changed at a portion that does not intersect with the optical axis.
  • the short focus lens optical system 100 may include an aperture arranged on the face S1 of the first lens 101, which faces the object side O.
  • the size of the aperture is adjusted, the quantity of light reaching the imaging face 181 of the image sensor 108 may be adjusted.
  • the short focus lens optical system 100 may further include a filter 107 disposed between the sixth lens 106 and the image sensor 108.
  • the filter 107 may block light detected by a sensor of an optical device (e.g., infrared ray).
  • the filter 107 may include at least one of, for example, a low pass filter and a cover glass.
  • the filter 107 allows visible light to pass while deflecting infrared rays so that the infrared rays are not transmitted to the imaging face 181 of the image sensor 108.
  • the short focus lens optical system 100 is not limited so that it must include the filter 106.
  • each of the fifth lens 105 and the six lens 106 may include a face having at least one inflection point.
  • the inflection point may refer to, for example, a point where the curvature radius is changed from positive (+) to negative (-) or negative (-) to positive (+).
  • the inflection point may refer to, for example, a point where the shape of a lens is changed from convexity to concavity or from concavity to convexity.
  • the curvature radius may refer to a value that indicates a degree of curvature at each point of, for example, a curved face or a surface.
  • the first lens 101 may increase the overall refractive power of the optical system 100 because it has larger positive refractive power, as compared to the other lenses 102, 103, 104, 105, and 106.
  • the face S1 of the first lens 101 which faces the object side, is convex, it is possible to reduce spherical aberration.
  • the second lens 102 may have larger positive refractive power, as compared to the other lenses 103, 104, 105, and 106.
  • the face S3 of the second lens 102, which faces the object side, and the face S4 of the second lens 102, which faces the image side are convex, it is possible to efficiently correct the spherical aberration of the optical system 100. Accordingly, the face S3 of the second lens 102, which faces the object side, and the face S4 of the second lens 102, which faces the image side, may reduce deterioration in performance of the optical system 100 caused by manufacturing errors.
  • the third lens 103 has negative refractive power and the face S5 of the third lens 103, which faces the object side, is concave.
  • the third lens 103 may effectively correct coma aberration and image curvature which may be caused by the second lens 102.
  • the third lens 103 may effectively correct chromatic aberration generated in the first lens 101 and the second lens 102.
  • the fourth lens 104 is an aspherical lens, it is possible to prevent coma aberration from being generated in a peripheral portion of the image sensor 108 (e.g., the portion furthest from the optical axis O-I).
  • the fourth lens 104 may have either positive refractive power or negative refractive power. Because the distribution of the refractive power of the short focus lens optical system 100 is determined by the first to third lenses 101, 102, and 103, the fourth lens 104 also may have no refractive power.
  • the short focus lens optical system 100 may enable the imaging face 181 of the image sensor to acquire an excellent image even under a low illuminance.
  • the sixth lens 106 may reduce the image face curvature from the center of the imaging face 181 of the image sensor to the peripheral portion thereof.
  • the above-described short focus lens optical system 100 may have an excellent optical characteristic while being miniaturized.
  • f may represent the focal distance of the entire optical system
  • f2 may represent the focal distance of the second lens 102.
  • a ratio of the focal distance of the second lens 102 in relation to the focal distance of the entire optical system is set to be less than 1.6, it is possible to prevent the increase of spherical aberration by the refractive power of the second lens 102.
  • the ratio of the focal distance of the second lens 102 in relation to the focal distance of the entire optical system is set to exceed 0.4, it is possible to prevent the refractive power of the first lens 101 from relatively increasing such that the short focus lens optical system 100 may have a field angle of about 80 degrees.
  • the third lens 103 may satisfy Equation 2 as follows.
  • R5" may represent the curvature radius of the face S5 of the third lens 103, which faces the object side
  • R6 may represent the curvature radius of the face S6 of the third lens 103, which faces the image side.
  • the ratio of the curvature radius of the face S6 of the third lens 103, which faces the image side, in relation to the curvature radius of the face S5 of the third lens 103, which faces the object side is set to exceed -0.6, it is possible to prevent the inclination of light directed to the imaging face 181 of the image sensor from increasing in relation to the optical axis, which is generated due to large diameter lenses.
  • the ratio of the curvature radius of the face S6 of the third lens 103, which faces the image side, in relation to the curvature radius of the face S5 of the third lens 103, which faces the object side is set to be less than 0.6, it is possible to properly correct the coma aberration by preventing the negative refractive power of the third lens 103. In a range out of the upper limit (i.e. when the ratio exceeds 0.6), it may become difficult to effectively correct the coma aberration or the machinability of the third lens may be deteriorated.
  • the third lens 103 may satisfy Equation 3 as follows.
  • vd may represent the Abbe number of the third lens.
  • the Abbe number of the third lens 103 is set to be less than 45, it is possible to prevent aberration (in particular, a longitudinal chromatic aberration) from increasing so as to increase image quality.
  • the second lens 102 may satisfy Equation 4 as follows.
  • R3 may represent the curvature radius of the face S3 of the second lens 102, which faces the object side
  • R4 may represent the curvature radius of the face S4 of the second lens 102, which faces the image side.
  • the inclination thereof becomes lower so that the spherical aberration value is reduced.
  • the ratio of Equation 4 exceeds 0, the spherical aberration may be subject to excessive overcorrection, and thus the aberration may increase again.
  • the fourth lens 104 may satisfy Equation 5 as follows.
  • f4 may represent the focal distance of the fourth lens 104.
  • the Petzval sum and the astigmatism of the imaging face 181 of the image sensor may be effectively corrected.
  • the ratio of the focal distance of the entire optical system in relation to the focal distance of the fourth lens 104 exceeds the upper limit of 0.15, reduction of the Petzval sum may be limited.
  • the ratio is smaller than the lower limit of -0.15, the difference in peripheral astigmatism becomes 10% or more so that it may be impossible to suppress the occurrence of the image face curvature on the imaging face 181 of the image sensor.
  • the short focus lens optical system 100 may satisfy Equation 6 as follows.
  • t58 may represent a distance (e.g., an air gap) on the optical axis from the face S5 of the third lens 103, which faces the object side, to the face S8 of the fourth lens 104, which faces the image side
  • Y IH may represent a maximum height of an image captured by the image sensor.
  • "Y IH " may be the radius of the image sensor 108.
  • the ratio of the y axis length of the image sensor 108 (Y IH ) in relation to the air gap t58 becomes less than 1, it is possible to reduce the length of the short focus lens optical system 100 in the direction of the optical axis O-I, and as the ratio of the y axis length of the image sensor 108 (Y IH ) in relation to the air gap t58 is set to be larger than 0, it is possible to effectively correct the Petzval sum and to prevent an image captured on the imaging face of the image sensor from being distorted.
  • the fifth lens 105 may satisfy Equation 7 as follows.
  • R9 may represent the curvature radius of the face S9 of the fifth lens 105, which faces the object side
  • R10 may represent the curvature radius of the face S10 of the fifth lens 105, which faces the image side.
  • the fifth lens 105 may reduce the amount of image face curvature generated on the imaging face 181 of the image sensor.
  • the sixth lens 106 may satisfy Equation 8 as follows.
  • R11 may represent the curvature radius of the face S11 of the sixth lens 106, which faces the object side
  • R12 may represent the curvature radius of the face S12 of the sixth lens 106, which faces the image side.
  • the sixth lens 106 may reduce the amount of image face curvature generated on the imaging face 181 of the image sensor.
  • the ratio of Equation 8 has a value exceeding 0.8, a problem may occur in that the inclination angle of peripheral light rays with respect to the main ray incident on the image face may rapidly increase.
  • the short focus lens optical system 100 may satisfy Equation 9 as follows.
  • TT may represent a distance on the optical axis from a face of the first lens, which faces the object side, to the imaging face of the image sensor.
  • TT in relation to the radius of the image sensor 108, Y IH , becomes smaller than 1.8, it is possible to reduce the length of the short focus lens optical system 100 in the direction of the optical axis.
  • S1 to S14 may indicate the faces of related lenses 101, 102, 103, 104, 105, and 106 and/or the surface of the filter 107.
  • sto* may represent an aperture provided on the face S1 of the first lens 101, which faces the object side.
  • Radius may represent the curvature radius
  • Thick may represent the thickness or an air gap
  • nd may represent the refractive index
  • vd may represent the Abbe number
  • H-Ape may represent the radius of the faces
  • ETL may represent the focal distance.
  • the short focus lens optical system 100 may satisfy the above-mentioned requirements (and/or at least one of the above-mentioned requirements) when the F-number is 1.76, the field angle is 82.20 degrees, and the focal distance is 4.10 mm.
  • Aspherical coefficients of the first to sixth lenses 101, 102, 103, 104, 105, and 106 are represented in Table 2 below in which the aspherical coefficients may be calculated through Equation 10 as follows.
  • z may represent a distance from the apex of a lens in the optical axis direction
  • c may represent a basic curvature of a lens
  • Y may represent a distance in a direction perpendicular to an optical axis
  • K may represent a Conic constant
  • A,” “B,” “C,” “D,” “E,” and “F” may represent aspherical coefficients, respectively.
  • FIG. 2 is a graph illustrating a spherical aberration of the short focus lens optical system 100 according to one of various embodiments of the present disclosure.
  • the horizontal axis represents a degree of a longitudinal spherical aberration
  • the vertical axis represents a normalized distance from the center of an optical axis.
  • a change in a longitudinal spherical aberration according to a wavelength of light is illustrated in FIG. 2.
  • Longitudinal spherical aberrations may be represented for lights having wavelengths of, for example, 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, or 435.8343 nm, respectively.
  • FIG. 3 is a graph illustrating an astigmatism of the short focus lens optical system 100 according to one of various embodiments of the present disclosure.
  • the astigmatism of the short focus lens optical system 100 is obtained at a wavelength of 546.074 nm.
  • the solid line represents an astigmatism in a tangential direction (e.g., a tangential field curvature)
  • the dot line represents an astigmatism in a sagittal direction (e.g., a sagittal field curvature).
  • FIG. 4 is a graph illustrating a distortion rate of the short focus lens optical system 100 according to one of various embodiments of the present disclosure.
  • an image captured through the short focus lens optical system 100 may have some distortion generated at a point that deviates from the optical axis O-I, but such distortion ordinarily occurs in an optical device that uses lenses.
  • the short focus lens optical system 100 may provide a good optical characteristic with a distortion rate of less than 3%.
  • FIG. 5 is a view illustrating a configuration of a short focus lens optical system 200 according to another one of various embodiments of the present disclosure.
  • FIG. 6 is a graph illustrating a spherical aberration of the short focus lens optical system 200 according to another one of various embodiments of the present disclosure.
  • FIG. 7 is a graph illustrating an astigmatism of the short focus lens optical system 200 according to another one of various embodiments of the present disclosure.
  • FIG. 8 is a graph illustrating a distortion rate of the short focus lens optical system 200 according to another one of various embodiments of the present disclosure.
  • the short focus lens optical system 200 may include a plurality of lenses 201, 202, 203, 204, 205, and 206, a filter 207, and an image sensor 208.
  • the short focus lens optical system 200 may satisfy the above-mentioned requirements (and/or at least one of the above-mentioned requirements) when the F-number is 1.72, the field angle is 79.05 degrees, and the focal distance is 3.97 mm.
  • FIG. 9 is a view illustrating a configuration of a short focus lens optical system 300 according to still another one of various embodiments of the present disclosure.
  • FIG. 10 is a graph illustrating a spherical aberration of the short focus lens optical system 300 according to still another one of various embodiments of the present disclosure.
  • FIG. 11 is a graph illustrating an astigmatism of the short focus lens optical system 300 according to still another one of various embodiments of the present disclosure.
  • FIG. 12 is a graph illustrating a distortion rate of the short focus lens optical system 300 according to still another one of various embodiments of the present disclosure.
  • the short focus lens optical system 300 may include a plurality of lenses 301, 302, 303, 304, 305, and 306, a filter 307, and an image sensor 308.
  • the short focus lens optical system 300 may satisfy the above-mentioned requirements (and/or at least one of the above-mentioned requirements) when the F-number is 1.77, the field angle is 80.17 degrees, and the focal distance is 3.88 mm.
  • FIG. 13 is a view illustrating a configuration of a short focus lens optical system 400 according to still another one of various embodiments of the present disclosure.
  • FIG. 14 is a graph illustrating a spherical aberration of the short focus lens optical system 400 according to still another one of various embodiments of the present disclosure.
  • FIG. 15 is a graph illustrating an astigmatism of the short focus lens optical system 400 according to still another one of various embodiments of the present disclosure.
  • FIG. 16 is a graph illustrating a distortion rate of the short focus lens optical system 400 according to still another one of various embodiments of the present disclosure.
  • the short focus lens optical system 400 may include a plurality of lenses 401, 402, 403, 404, 405, and 406, a filter 407, and an image sensor 408.
  • the short focus lens optical system 400 may satisfy the above-mentioned requirements (and/or at least one of the above-mentioned requirements) when the F-number is 1.72, the field angle is 79.23 degrees, and the focal distance is 3.95 mm.
  • FIG. 17 is a view illustrating a configuration of a short focus lens optical system 500 according to yet another one of various embodiments of the present disclosure.
  • FIG. 18 is a graph illustrating a spherical aberration of the short focus lens optical system 500 according to yet another one of various embodiments of the present disclosure.
  • FIG. 19 is a graph illustrating an astigmatism of the short focus lens optical system 500 according to yet another one of various embodiments of the present disclosure.
  • FIG. 20 is a graph illustrating a distortion rate of the short focus lens optical system 500 according to still another one of various embodiments of the present disclosure.
  • the short focus lens optical system 500 may include a plurality of lenses 501, 502, 503, 504, 505, and 506, a filter 507, and an image sensor 508.
  • the short focus lens optical system 500 may satisfy the above-mentioned requirements (and/or at least one of the above-mentioned requirements) when the F-number is 1.82, the field angle is 76.00 degrees, and the focal distance is 4.00 mm.
  • Embodiment 1 1.187 0.393 21.485 -0.265 0.019 0.117 0.372 0.011 1.523 Embodiment 2 1.137 0.456 21.485 -0.158 0.121 0.143 0.440 0.027 1.500 Embodiment 3 1.133 0.495 21.500 -0.182 -0.119 0.129 0.168 0.014 1.527 Embodiment 4 1.156 0.503 35.000 -0.176 -0.133 0.144 0.276 0.035 1.571 Embodiment 5 0.741 -0.500 21.485 -0.987 0.000 0.098 1.504 0.507 1.397
  • Embodiment 1 may refer to the short focus lens optical system 100 illustrated in FIG. 1
  • Embodiment 2 may refer to the short focus lens optical system 200 illustrated in FIG. 5
  • Embodiment 3 may refer to the short focus lens optical system 300 illustrated in FIG. 9
  • Embodiment 4" may refer to the short focus lens optical system 400 illustrated in FIG. 13
  • Embodiment 5" may refer to the short focus lens optical system 500 illustrated in FIG. 17.
  • a short focus lens optical system 100, 200, 300, 400, or 500 may include a small number of lenses (e.g., six (6) lenses), and may easily acquire an image of high quality (e.g., a bright image with a high resolution) by adjusting the curvature radius of the faces of each lens.
  • a small number of lenses e.g., six (6) lenses
  • an image of high quality e.g., a bright image with a high resolution
  • an optical system may include: a first lens having a positive refractive power and disposed along an optical axis and to face an object, the first lens further having a first convex face facing the object; a second lens having a positive refractive power and disposed along the optical axis adjacent to the first lens, the second lens further having a second convex face facing the object; a third lens having a negative refractive power and disposed along the optical axis adjacent to the second lens, the third lens further having a third concave face facing an image sensor; a fourth lens disposed along the optical axis adjacent to the third lens, the fourth lens being an aspherical lens; a fifth lens disposed along the optical axis adjacent to the fourth lens, the fifth lens being an aspherical lens and having a fourth face facing the object, the fourth face being convex where the fifth lens intersects the optical axis; and a sixth lens disposed along the optical axis adjacent to the fifth lens, the
  • f represents a focal distance of the optical system
  • f2 represents a focal distance of the second lens
  • characteristics of the third lens satisfy equation:
  • R5 represents a curvature radius of a face of the third lens facing the object
  • R6 represents a curvature radius of the third concave face of the third lens facing the image sensor
  • characteristics of the third lens satisfy equation:
  • vd represents an Abbe number of the third lens.
  • characteristics of the second lens satisfy equation:
  • R3 represents a curvature radius of the second convex face of the second lens facing the object
  • R4 represents a curvature radius of a face of the second lens facing the image sensor
  • the characteristics of the fourth lens satisfy equation:
  • f4 represents a focal distance of the fourth lens.
  • characteristics of the third lens and the fourth lens satisfy equation:
  • t58 represents a distance on the optical axis from a face of the third lens facing the object to a face of the fourth lens facing the image sensor
  • Y IH represents a maximum height of an image captured by the image sensor
  • characteristics of the fifth lens satisfy equation:
  • R9 represents a curvature radius of the fourth face of the fifth lens facing the object
  • R10 represents a curvature radius of a face of the fifth lens facing the image sensor
  • characteristics of the sixth lens satisfy equation:
  • R11 represents a curvature radius of the fifth face of the sixth lens facing the object
  • R12 represents a curvature radius of a face of the sixth lens facing the image sensor
  • characteristics of the first lens satisfy equation:
  • TT represents a distance on the optical axis from the first face of the first lens facing the object to an imaging face of the image sensor
  • Y IH represents a maximum height of an image captured by the image sensor
  • the optical system has a field angle of approximately 80 degrees.
  • an imaging device may include: an optical system; an image sensor for detecting an image of an object; and an image signal processor.
  • the optical system may include: a first lens having a positive refractive power and disposed along an optical axis and to face the object, the first lens further having a first convex face facing the object; a second lens having a positive refractive power and disposed along the optical axis adjacent to the first lens, the second lens further having a second convex face facing the object; a third lens having a negative refractive power and disposed along the optical axis adjacent to the second lens, the third lens further having a third concave face facing the image sensor; a fourth lens disposed along the optical axis adjacent to the third lens, the fourth lens being an aspherical lens; a fifth lens disposed along the optical axis adjacent to the fourth lens, the fifth lens being an aspherical lens and having a fourth face facing the object, the fourth face being convex where the fifth lens
  • f represents a focal distance of the optical system
  • f2 represents a focal distance of the second lens
  • characteristics of the third lens satisfy equation:
  • R5 represents a curvature radius of a face of the third lens facing the object
  • R6 represents a curvature radius of the third concave face of the third lens facing the image sensor
  • the characteristics of the third lens satisfy equation:
  • vd represents an Abbe number of the third lens.
  • the characteristics of the second lens satisfy equation:
  • R3 represents a curvature radius of the second convex face of the second lens facing the object
  • R4 represents a curvature radius of a face of the second lens facing the image sensor
  • characteristics of the fourth lens satisfy equation:
  • f4 represents a focal distance of the fourth lens.
  • characteristics of the third lens and the fourth lens satisfy equation:
  • t58 represents a distance on the optical axis from a face of the third lens facing the object to a face of the fourth lens facing the image sensor
  • Y IH represents a maximum height of the image detected by the image sensor
  • characteristics of the fifth lens satisfy equation:
  • R9 represents a curvature radius of the fourth face of the fifth lens facing the object
  • R10 represents a curvature radius of a face of the fifth lens facing the image sensor
  • characteristics of the sixth lens satisfy equation:
  • R11 represents a curvature radius of the fifth face of the sixth lens facing the object
  • R12 represents a curvature radius of a face of the sixth lens facing the image sensor
  • characteristics of the first lens satisfy equation:
  • TT represents a distance on the optical axis from the first face of the first lens facing the object, to an imaging face of the image sensor
  • Y IH represents a maximum height of an image detected by the image sensor
  • the image sensor may detect an image that sequentially passes the first, second, third, fourth, fifth, and sixth lenses, and the image signal processor may store or output the image.
  • An imaging device may further include a memory that stores the image.
  • the control unit or processor may include a microprocessor or any suitable type of processing circuitry, such as one or more general-purpose processors (e.g., ARM-based processors), a Digital Signal Processor (DSP), a Programmable Logic Device (PLD), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), a Graphical Processing Unit (GPU), a video card controller, etc.
  • general-purpose processors e.g., ARM-based processors
  • DSP Digital Signal Processor
  • PLD Programmable Logic Device
  • ASIC Application-Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • GPU Graphical Processing Unit
  • any of the functions and steps provided in the Figures may be implemented in hardware, software or a combination of both and may be performed in whole or in part within the programmed instructions of a computer.
  • a "processor” or “microprocessor” may be hardware in the claimed disclosure.
  • the computer, the processor, microprocessor controller or the programmable hardware include memory components, e.g., RAM, ROM, Flash, etc. that may store or receive software or computer code that when accessed and executed by the computer, processor or hardware implement the processing methods described herein.
  • memory components e.g., RAM, ROM, Flash, etc. that may store or receive software or computer code that when accessed and executed by the computer, processor or hardware implement the processing methods described herein.
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EP3335067A1 (en) 2018-06-20
US20170123187A1 (en) 2017-05-04

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